Answer:
To help understand trends, identify patterns, or assist in explaining a particular phenomenon.
The best economic system in this ocassion it can be what to produce and have variety of different resources.
This can help customers to be frwe to select and don't have monopolie and select what their want.
I don’t know the answer sorry
Nation states are difficult to create because of colonies ((tell me if u need to know why because I can help with that))